Recently, many regions in southern China have experienced unusually warm and dry weather, leaving residents puzzled: “Wasn’t Xiaohan supposed to be cold? Why is it so dry and warm?” Traditionally, Xiaohan (Minor Cold)—which usually falls around January 5th or 6th—marks one of the coldest periods of the year, especially in northern China, often accompanied by snow and freezing temperatures. However, this year, a strong subtropical high-pressure system combined with weak cold air masses has prevented significant cooling in the south. Instead, sunny and dry conditions have persisted, with daytime highs in some areas exceeding 20°C, creating a spring-like feel.Meteorologists explain that this anomaly is closely linked to shifts in atmospheric circulation patterns under global warming. An unusually strong subtropical high and infrequent cold surges have blocked typical winter chill from reaching southern regions. Coupled with scarce rainfall, these conditions have led to mild to moderate meteorological drought in parts of the area.While the unseasonable warmth offers temporary relief from harsh winter cold, it may negatively impact agriculture, ecosystems, and public health—disrupting crop growth cycles, increasing overwintering pest survival rates, and exacerbating respiratory issues due to dry air. Experts advise the public to stay informed about weather forecasts, maintain healthy hydration, and remain vigilant about fire safety.
近日，我国南方多地气温明显偏高、空气干燥，不少居民直呼‘说好的小寒怎么又干又暖？’。按照传统节气，小寒（通常在1月5日或6日）是一年中最寒冷的时段之一，尤其在北方，常伴随降雪和低温。然而今年，受强盛的暖高压系统和弱冷空气影响，南方地区不仅未见明显降温，反而持续晴朗干燥，多地最高气温甚至超过20℃，体感温暖如春。气象专家指出，这种异常气候与全球变暖背景下的大气环流变化密切相关。副热带高压偏强、冷空气活动偏弱，导致寒潮难以南下，使得本该湿冷的南方变得干暖。此外，降水稀少也加剧了空气干燥，部分地区已出现轻度至中度气象干旱。这种‘暖冬’现象虽让人暂时免于严寒之苦，但也可能对农业、生态和人体健康带来不利影响。例如，越冬作物生长节奏被打乱，病虫害越冬存活率上升，以及因干燥引发的呼吸道不适等。专家建议公众关注天气变化，合理安排生活起居，并注意补水保湿和防火安全。
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